[英]Change foreign key constraint naming convention
We have our own external convention of naming objects and I need to change the naming convention for the auto generated foreign key constraints. 我们有自己的命名对象的外部约定,我需要更改自动生成的外键约束的命名约定。 Now it looks like:
FK_dbo.City_dbo.CityType_City_CityTypeId
but I would like it to be called City_FKC_CityType
. 现在它看起来像:
FK_dbo.City_dbo.CityType_City_CityTypeId
但我希望它被称为City_FKC_CityType
。
I found a similar question which says that you can change the name of constraints manually. 我发现了一个类似的问题 ,说你可以手动更改约束的名称。 However, this does not suit me, since I have a lot of tables and foreign key constraints.
但是,这不适合我,因为我有很多表和外键约束。
I found some information about "Custom Code First Conventions" and I am wondering if I can change the name of constraint using this or if there are any methods to implement it? 我找到了一些关于“自定义代码优先约定”的信息,我想知道我是否可以使用此更改约束的名称,或者是否有任何方法来实现它?
Another variant is download the source code of EF, make changes and use that but that is in case of emergency. 另一个变体是下载EF的源代码,进行更改并使用它,但是在紧急情况下。
As a side note, I would also like to change the naming convention of the primary key. 作为旁注,我还想更改主键的命名约定。
You can implement a custom sql generator class derived from SqlServerMigrationSqlGenerator
from System.Data.Entity.SqlServer
namespace: 您可以从
System.Data.Entity.SqlServer
命名空间实现从SqlServerMigrationSqlGenerator
派生的自定义sql生成器类:
public class CustomSqlGenerator : SqlServerMigrationSqlGenerator
{
protected override void Generate(AddForeignKeyOperation addForeignKeyOperation)
{
addForeignKeyOperation.Name = getFkName(addForeignKeyOperation.PrincipalTable,
addForeignKeyOperation.DependentTable, addForeignKeyOperation.DependentColumns.ToArray());
base.Generate(addForeignKeyOperation);
}
protected override void Generate(DropForeignKeyOperation dropForeignKeyOperation)
{
dropForeignKeyOperation.Name = getFkName(dropForeignKeyOperation.PrincipalTable,
dropForeignKeyOperation.DependentTable, dropForeignKeyOperation.DependentColumns.ToArray());
base.Generate(dropForeignKeyOperation);
}
private static string getFkName(string primaryKeyTable, string foreignKeyTable, params string[] foreignTableFields)
{
// Return any format you need
}
}
Then you need to register your generator in DbContext
using DbConfiguration
: 然后,您需要使用
DbConfiguration
在DbContext
注册您的生成器:
public class CustomDbConfiguration : DbConfiguration
{
public CustomDbConfiguration()
{
SetMigrationSqlGenerator(SqlProviderServices.ProviderInvariantName,
() => new CustomSqlGenerator());
}
}
And DbConfigurationTypeAttribute
: 和
DbConfigurationTypeAttribute
:
[DbConfigurationType(typeof(CustomDbConfiguration))]
public class YourEntities : DbContext
UPDATE: If you want to change a primary key name, you need to override following Generate
methods: 更新:如果要更改主键名称,则需要覆盖以下
Generate
方法:
protected override void Generate(CreateTableOperation createTableOperation)
{
createTableOperation.PrimaryKey.Name = getPkName(createTableOperation.Name);
base.Generate(createTableOperation);
}
protected override void Generate(AddPrimaryKeyOperation addPrimaryKeyOperation)
{
addPrimaryKeyOperation.Name = getPkName(addPrimaryKeyOperation.Table);
base.Generate(addPrimaryKeyOperation);
}
protected override void Generate(DropPrimaryKeyOperation dropPrimaryKeyOperation)
{
dropPrimaryKeyOperation.Name = getPkName(dropPrimaryKeyOperation.Table);
base.Generate(dropPrimaryKeyOperation);
}
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